摘要
拔节氮肥增加了小麦穗弱势部位(顶部、基部小穗及中部小穗的第三小花)的籽粒总重,其原因是这些部位籽粒的退化率降低,结实粒数增加,单粒重变化则不规律;中部小穗第1～2籽粒的发育不受氮肥的影响,结实率及单粒重均无显著变化。这表明,拔节氮肥有助于改善小麦穗强、弱势花(籽粒)发育不平衡的特点。
The total Weight of grains on inferior parts of Wheat ear (top spikelets, basal spikelets and the 3rd rioters of central spikelets) was increased when N was applied in jointing period, It was due to the increase of grain number as well as the decrease of sterile ratio of grains on these parts, meanwhile, the single grain weight changed in different ways, The development of the 1st and 2nd grains of central spikelets was not influenced by N application, the percentage of seed setting and single grain weight didn't change significantly. It was suggested that N applied in jointing period helped improve the characteristic of unbalanced development of the superior and interior spike lets in wheat ear.
关键词
小麦
籽粒
拔节期
施肥
氮
winter wheat
grain development
jointing fertilization
